Composition for preventing set-off in printing.



UNITED STATES PATENT CEEICE.

GEORGESTEELE DUNCAN AND GEORGE H N Y POTTS, OF EDINBURGH, SCOTLAN ASSIGNORS 'ro AMERICAN OFFSET COMPANY, on NEW YORK, N. Y., A CORPORATION OF NEW YORK.

COMPOSITION FOR PREVENTING SET-OFFS IN PRINTING- To all whom it may concern:

Be it known that we,GEoReE STEELE'DUN- CAN and GEORGE HENRY PoTTs, subjects of the King of the United Kingdom of Great Britain and Ireland, residing at Edinburgh,

Scotland, have invented certain new and useful Improvements in Composition for Fre venting Set-Offs in Printing, of which the following is a specification. v I

In the specification of application Serial No. 259 ,37 4 is described a liquid com osition to be used for damping the set- 0 rollers in printing-machines to revent set-ofi or transfer of ink from one s eet to another or from one side to the reverse side of a sheet in printing.

Our present invention hasfor its object the provision of a liquid composition which may be used in the same-manner as the liquid composition the subject of the said appllcation, but differing therefrom in its composition. q

' The liquid composition the subject of our present invention possesses es ecial advantages for use in single-side mac ines and perfecters which are not provided with rollers suitable to be; damped with the liquid; In

using the liquid the subject of our'present invention in such single-slde machines and perfecters the fixed set-off sheet is washed over with the liquid.

The constituents of the liquid composition the subject of our present invention are palm- Specification of Letters Patent.

Application filed August '7, 1905. Serial No. 273,139.

Patented June 19 1906.

,' oil, lard-oil, cotton-seed oil, and sperm or colza oils, methylated spirit, naphtha, andturpentine, the two last as ordinarily used by printers. The best proportions-are as follows,

the parts being by volume: palm-oil, three arts, (measured after just liquefying by eat lard-oil, two arts; cotton-seed oil,

two parts sperm or light colza, one and one half arts; methylated spirits, two parts;

napht a, five parts; tur entine, one part. It

sperm-oil, methylated spirits, naphtha and tur entine.

n testimony whereof We have signed our names to this specification in the presence of two subscribing witnesses.

CEoRCE STEELE DUNCAN. GEORGE HENRY POTTS.

Witnesses: I

MARY MCOREDIE,

WALLACE ORANsToN FAI WEATHER. 

